I have a 2002 f150 with The 6 disk changer behind the seat, also with a tape player in the radio itself. The tape player would not work with out eating tape, and no one even sales tapes anymore. I just got a new smart phone, and had all these opions so i opened my stock CD player up ( I did not want to cut wires) I found The left and right Input, and a ground in the tape deck and soldered Those to the computer board. drilled a small hole in the dash and mounted the Aux input. Whne i tryed the Tape with the Wire that you pluged in to my phone i got alot of static, this way it is Clear. now the only problem i am having is When i am conected to the aux port with my phone, and also charging the phone at the same time i get what i have always call motor noise ( Static). =Is this becouse i have common grounds? and would a Ground Loop isulator work to take out the static? I will get some pictures the next time i have my dash apart installing the Ground loop. right now i have about $3.00 in it, if i need the Isulator i will have about 15 to 20 dollors in it. I can play pandora intenet radio on my phone, and also have my playlist from my computer on my phone so i have all the music i can handle. LOL If any one has questions just let me know

 

Does it sound like you are getting an alternator whine when you drive, or rev up though the stereo?

 

yes, ( some call it alt noise, some call it motor noise).

 

also i tryed it with the phone charging, using head phones and i get no static, witch is why i am leaning to the problem being common ground conections.

 

Sounds like a ground issue to me.

 

That is what i think to, but the noise is only there when charging, and having the Aux cord conected. ( I dont have any noise when charging and lesing with head phones, so that to me only leads to having common grounds, where a loop isullator would fix the problem, just wanting more opions before i order one. If i turn the volume up on the phone and the vol. down on the radio i can not hear it at all. but that also kills the phone battery faster.

 

I would try a small diode before I went and bought a ground loop isolater..

 

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i did not do any work with the wires, just iside the radio, so i am thinking the radio, and the 12 v power outlet is on the same ground and that is cousing the feed back.

 

But you also said it was messing up before you did this when a tape was in it. I'd still check all the grounds. But if you think it's the ground inside the radio from where you added your own wires, undo that ground, get a nice long jumper cable and ground it out somewhere else and see what happens.